Did Humans Arrive in the Americas Later Than We Thought? Monte Verde Re-examined

The fossilized footprints person revealed earlier quality accomplishment successful the Americas than antecedently though. Credit: Public Domain / Wikimedia Commons

A landmark archaeological site successful Chile that shaped technological knowing of erstwhile humans archetypal arrived successful the Americas whitethorn beryllium tens of thousands of years younger than erstwhile believed, according to a caller survey published successful the diary Science.

For astir fractional a century, Monte Verde successful confederate Chile stood arsenic the cornerstone of pre-Clovis archaeology. Scientists dated the tract to astir 14,500 years ago, making it 1 of the oldest known records of quality colony successful the Western Hemisphere.

A squad led by Todd A. Surovell of the University of Wyoming has present produced the archetypal autarkic introspection of the tract since archetypal excavations began successful the 1970s. Their decision sharply contradicts the established dating.

Monte Verde: The tract that defined American prehistory

The probe squad collected and analyzed sediment samples from aggregate locations on Chinchihuapi Creek, which runs beside the site. During that process, they identified a furniture of volcanic ash buried beneath the Monte Verde archaeological material. That ash traced backmost to a volcanic eruption astir 11,000 years ago.

Because the artifacts beryllium supra that ash layer, they cannot predate it. Based connected this, Surovell and his colleagues determined Monte Verde is nary older than 8,200 years, placing it successful the Middle Holocene period.

Monte Verde archaeological tract successful Chile. Credit: Geología Valdivia / Wikimedia Commons / CC BY 2.0

Claudio Latorre, a co-author based astatine the Pontifical Catholic University of Chile, said the squad conducted a implicit reinterpretation of the site’s geology and reached a precise antithetic decision from earlier researchers.

The squad besides argued that earthy processes, peculiarly watercourse erosion that shifted and blended sediment layers implicit centuries, apt caused earlier researchers to mistakenly subordinate past materials with the incorrect clip period.

Buried ash furniture points to a acold younger site

The conclusions person drawn crisp criticism. Michael Waters of Texas A&M University, who played nary relation successful either the archetypal excavations oregon the new study, said the findings magnitude to an unproven proposal that the presented information simply does not support.

Tom Dillehay of Vanderbilt University, who directed the archetypal Monte Verde excavations, was arsenic dismissive. He argued the survey overlooks an extended assemblage of reliably dated taste evidence, pointing to artifacts recovered straight from the site, including a sharpened mastodon tusk, a woody spear, and a fire-charred digging tool.

Other extracurricular researchers raised concerns that the caller squad examined the terrain surrounding Monte Verde alternatively than the tract itself, wherever geological conditions disagree considerably. They besides questioned whether the volcanic ash deposit ever extended crossed the afloat landscape.

Rethinking erstwhile humans archetypal arrived successful the Americas

Surovell defended the approach, saying the squad gathered samples from wrong the tract and from points some upstream and downstream on the creek.

The implications agelong good beyond a azygous site. Monte Verde’s archetypal dating helped overturn the long-held content that the Clovis people, who lived astir 13,000 years ago, were the archetypal humans to scope the Americas.

Surovell said autarkic re-examination of different aboriginal archaeological sites volition beryllium captious going forward, and expressed assurance that science, fixed capable time, volition scope close conclusions.